Gas blast circuit breaker



May 1l, 1943. A. HALM GAs BLAST CIRCUIT BREAKER Filed May 28, 1941 dllPatented May 11, 1943 UNITED STATES PATENT OFFICE GAS BLAST CIRCUITBREAKER land Application May 28, 1941, Serial No. 395,689 In SwitzerlandJune 8, 1940 4 Claims.

In gas blast circuit breakers the blow valve for extinguishing the arcis generally arranged so that the direction of flow of the gas blast isdiverted either whilst passing through the valve itself or before andafter the valve. All known arrangements of this kind thus have thedisadvantage that the rupturing capacity is diminished because thesechanges in the direction of the gas blast decrease the velocity of flowandv cause eddies to form.

The present invention concerns a gas blast circuit breaker the switchchamber of which is built together with a supporting insulator in theform of a column, the aforementioned disadvantages being overcome byarranging inside the column between the switch chamber and the insulatora blow valve so constructed that the direction of ow of the compressedgas through the valve lies inthe axis determined by the supply pipe andthe switch chamber.

A constructional example of the invention is illustrateddiagrammatically in Fig. 1 of the drawing, Fig. 2 shows a sectional viewof the blow valve to an enlarged scale.

The switch chamber a of the gas blast circuit breaker is mounted bymeans of the coupling b on the supporting insulator c so as to form acolumn which is carried by the baseplate d. 'I'his baseplate is builtlto serve asaI compressed gas container and can if necessary be madeportable. e indicates a voltage isolating switch blade thecounter-contact of which is mounted on the supporting insulator f. Theswitch chamber a contains one or more circuit interrupting pointsarranged in series. A11 insulating parts can be built with or withoutpetticoats. The compressed gas is supplied to the circuit interruptingcontacts from container d through conduits y, y1 and blow valve hlocated in the coupling piece b. The control mechanism for regulatingthe gas supply is not shown in the drawing because it is not anessential element of the invention; it can be operated by hand,pneumatically or electropneumatically. 'I'he valve disc of the blowvalve is xed in a guide tube k which slides in a cylindrical bore insidethe valve body. n the outside of the guide tube k is a piston m locatedin a slot in the valve body and acted on by the ,closing spring n.

In order to open the blow valve compressed gas is passed from thecontainer d. through the opening 0 in the valve body to the side of thepiston m Opposite to that on which the closing spring n is located. Thecompressed gas stream can thus flow in a straight line from the gascontainer through the blow valve to the switch chamber, without beingdeviated from its course so that favourable conditions for extinguishingthe arc are obtained.

The guide tube k can also be built as a slide valve which controls gasinlet and outlet openings in the blow valve body and serves to exhaustthe switch chamber in the same manner as the bore p. This guide tube kcan also be employed for special control purposes.

I claim:

1. Gas blast circuit breaker the switch chamber of which is builttogether with a, supporting insulator in the form of a column,characterised by the feature that in the coupling piece between theswitch chamber and the insulator a blow valve is arranged, said valvebeing provided with a cylindrical guide for the valve disc and apressure piston for opening the valve against the action of a closingspring so that the direction of iiow of the compressed gas through saidvalve lies in the direction of the axis determined by the gas supplypipe and the switch chamber.

2. Gas blast circuit breaker as in claim 1, characterised by the featurethat the valve disc is xed in a guide tube on the outside of which anannular piston is arranged.

3. Gas blast circuit breaker as in claim 1, characterised by the featurethat the valve disc is fixed in a guide tube which is built in the formof a slide valve which controls gas ports in the valve body.

4. A gas blast circuit breaker having a tubular switch chamber and atubular supporting insulator arranged in a straight column, a couplingmember between the switch chamber and the insulator and a disc blowvalve mounted in said coupling member for movement in the direction ofthe axis of said column so that the direction of movement of the valvedisc and of the pressure gas through said column is in the straight lineaxis o1' said column.

ALFRED HAIM.

